Method and device for connecting two components and an assembly of the components

ABSTRACT

A method and device for connecting two components by way of high fluid pressure are provided, the components being pushed onto one another, and the two components then being pressed against one another by way of the high pressure. In order to interconnect components in a relatively simple and controlled manner without any limitation with regard to the minimum size of an inside diameter of the components and with regard to the design of the inner component, the outer component, the material of which has a yield point which is lower than that of the inner component, is plastically deformed by high-pressure action acting on the sliding assembly from outside, the inner component being elastically deformed. An assembly of the components is also provided.

BACKGROUND AND SUMMARY OF THE INVENTION

[0001] This application claims the priority of German Patent Document DE101 34 086.9, filed Jul. 13, 2001, the disclosure of which is expresslyincorporated by reference herein.

[0002] The invention relates to a method for connecting two componentsby high fluid pressure, the components being pushed onto one another andthen being pressed against one another by way of the high pressure, anda device for connecting two components by way of high fluid pressure,comprising a high-fluid-pressure generator by which a sliding assemblyof the components pushed onto one another can be acted on by the fluidpressure in such a manner that the components bear against one anotherin a press fit.

[0003] A generic method and generic device are known from, for example,U.S. Pat. No. 3,977,068. In this case, a tubular component is pushedinto a through-hole of a plate-shaped component with play, after whichan expanding lance is inserted into the tubular component, by means ofwhich lance the tubular component is, by high internal fluid pressure,plastically expanded in such a manner that it comes to bear against theinside of the through-hole of the plate-shaped component. The latter islikewise expanded in the region of the hole, but only within the limitof the material elasticity. After the high internal pressure has beenreleased, the hole wall recovers elastically, so that a virtuallypermanent press fit results, in the hole region, between the tubularcomponent and the plate-shaped component. The expanding lance is formedby a rod made of a rigid solid material, preferably steel, which has anaxially extending pressure duct for guiding the pressure fluid. Theaxial pressure duct is a blind bore and opens, shortly before its end,into two ducts which branch off radially and have their outlets in thelateral surface of the rod. In the in-use position of the expandinglance, the outlets lie inside the region to be expanded of the tubularcomponent. This region is sealed axially so as to be resistant to highpressure by two annular seals which are spaced from one another and areaccommodated in two annular grooves let into the lateral surface of therod.

[0004] As the expanding lance is inserted into a tubular component and,for reasons of strength, has to have a specific minimum cross sectiondepending on the high pressure to be applied, the inner component mustnecessarily likewise have a minimum inside diameter. Applicability toinner components with a small inside diameter is thus not possible withthe known art. Moreover, the necessity of inserting the expanding lancemakes it a prerequisite that the inner component must be hollow. Onaccount of the limited long-term strength of the expanding lance, inparticular in the case of thinner examples, use of the lance in seriesproduction leads to a relatively expensive production process for thejoint connection as a result of the frequent tool-changing owing to toolwear and the associated down-times.

[0005] An aspect of the invention is, therefore, to develop a method anda device to the effect that components can, in a relatively simple andcontrolled manner, be interconnected without any limitation with regardto the minimum size of an inside diameter of the components and withregard to the design of the inner component.

[0006] According to certain preferred embodiments of the invention, thisaspect is achieved in that an outer component of the two components, thematerial of which has a yield point which is lower than that of an innercomponent of the two components, is plastically deformed byhigh-pressure action acting on the two components from outside, theinner component being elastically deformed, with regard to the method;and in that the deforming tool surrounds the sliding assembly at leastat a site of the press fit to be produced, wherein the deforming toolhas a pressure duct which, connected to the high-fluid-pressuregenerator, leads from outside into an impression of the tool, whichreceives the sliding assembly, and an outlet of the duct is located atthe site of the press fit to be produced, and wherein a sealingarrangement is arranged on an inner side of the impression on both sidesof the site of the press fit to be produced, which sealing arrangementsseal this site axially in a high-pressure-tight manner, with regard tothe device.

[0007] Owing to the fact that the deforming action comes from outside,the requirement for inserting an expanding lance into an inner componentis dispensed with. The dropping of the expanding lance means that thereare no problems for the production process for the joint connectionbetween the two components with regard to stability either, that is tosay, wear of the tool to be inserted. As a result of this, the regularcosts for the production of the connection are at the same time reduced.Furthermore, the shape of the inner component is no longer dependent ona minimum cross section of the lance. The inner components can thus nowbe polygonal, tubular, unsymmetrical, bent a number of times or evenmade of solid material

[0008] The limited criteria for the controlled production of the jointconnection are, on the one hand, the possibility of pushing the outercomponent onto the inner component and, on the other hand, the matchingof the materials and, if appropriate, the wall thicknesses of thecomponents to one another, so that, when acted on by pressure fluid, theouter component is deformed plastically and the inner component isdeformed elastically. This is embodied in the existence of anextensively closed opening of the outer component, into or through whichthe inner component is pushed or inserted, and in the elastic recoveryof the material of the inner component outwards against the plasticallyshrunk outer component after release of the fluid pressure. This givesrise to the press fit between the two components which is soughtaccording to certain preferred embodiments of the invention and thestrength of which can advantageously be matched to the applicationconcerned by variable control of the level of the fluid pressure, sothat all strengths of the press fit can be set selectively betweennon-detachability and detachability of the press fit occasioned as of agiven axial mechanical tension or pressure or a torque, for example foroverload protection.

[0009] The long-term strength of the device according to certainpreferred embodiments of the invention is absolutely assured, as thesolidity of the deforming tool can be selected freely depending on themethod. The smallness of the outside diameter of the components isdetermined only by the constructional feasibility of sealingarrangements in terms of their miniaturization. In comparison with knowngeneric methods, considerably smaller components can consequently bejoined together.

[0010] Expedient developments of the invention emerge from the preferredembodiments. Other objects, advantages and novel features of the presentinvention will become apparent from the following detailed descriptionof the invention when considered in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011]FIG. 1 shows a lateral longitudinal section of a deforming tool ofa device without components to be joined,

[0012]FIG. 2 shows a cross section of an outer component and an innercomponent in sliding position before the production of a press fit,

[0013]FIG. 3 shows a cross section of the components from FIG. 2 afterthe production of the press fit, and

[0014]FIG. 4 shows a lateral longitudinal section of a deforming toolaccording to a preferred embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS

[0015]FIG. 1 illustrates a deforming tool 1 of a device for connectingtwo components by way of high fluid pressure, which is of solid,one-piece design and has a passage which forms the tool impression 2.Instead of the simple design of the apparatus in one piece, thedeforming tool 1 can also be divided into an upper die and a lower die,which affords advantages in terms of accessibility of the components tobe joined, in particular when the components are introduced into thedeforming tool 1 in a sliding assembly and have to remain accuratelyaxially and/or radially positioned in relation to one another in theprocess. An all-round cutout 3, which is open on one side axially, isrecessed into the impression 2. The cutout 3 receives two sealingarrangements 5 and 7, and a spacer sleeve 6 which spaces these from oneanother. The sealing arrangement 5 is supported against the axial stopface 4 of the cutout 3. The spacer sleeve 6 is supported axially againstthe sealing arrangement 5, and the other sealing arrangement 7 is inturn supported axially against the spacer sleeve. Although it would alsobe possible to insert the sealing arrangements 5 and 7 into annulargrooves in the impression 2 which are axially separated from oneanother, and a spacer sleeve 6 would then be omitted, the solutionillustrated affords clear advantages in terms of the insertability orexchangeability of the sealing arrangements 5 and 7 in the event of wearof the sealing arrangements or in the event of the use ofdifferent—larger or smaller—sealing arrangements in the case of a changein application to larger or smaller components or to components ofdifferent cross-sectional shape.

[0016] The deforming tool 1 has a pressure duct 8 which is connected onone side to an external high-fluid-pressure generator 32 and leads fromoutside into the impression 2 of the tool 1, which receives the slidingassembly. The outlet 9 of the pressure duct 8 is located at the site ofthe press fit to be produced. In this connection, the pressure duct 8extends in a simple manner through the wall 10 of the spacer sleeve 6,the inner side 11 of which forms the majority of the impression 2 of thedeforming tool 1 along the site of the press fit to be produced, whichsimplifies the design of the deforming tool 1 and increases thecompactness of the tool 1. In order to achieve as uniform as possible apressure action on the sliding assembly at the site of the press fit tobe produced, an all-round recess 30 can be let into the impression 2 inthe event of the absence of a spacer sleeve 6 or into the inner side 11of the spacer sleeve 6, into which recess the pressure duct 8 opens, andwhich recess extends along the site of the press fit to be produced, asshown in FIG. 4. This is especially advantageous when the slidingassembly lies closely against the impression 2 or the inner side 11 ofthe spacer sleeve 6.

[0017] It is also conceivable for the outlet 9 of the pressure duct 8 orsaid recess to be covered by an elastic diaphragm 31 towards theimpression 2, which diaphragm 31 is fastened to the impression 2 or theinner side 11 of the spacer sleeve 6. Dry deformation of the slidingassembly is achieved by way of the diaphragm 31, the diaphragm 31 beingapplied against the outer component of the sliding assembly in apressure-conveying manner when fluid pressure is generated. This isadvantageous on the one hand for protecting corrosion-sensitivecomponent materials and on the other hand for conserving resources. Overand above this, sealing arrangements can be forgone, simplifying thetool.

[0018] The sealing arrangements 5 and 7 comprise an elastic sealing ring12 made of a thermoplastic elastomer, the low abrasion of which duringinsertion and withdrawal of the sliding assembly of the componentsguarantees great long-term durability, and, on the side facing away fromthe site of the press fit to be produced, an adjacent support ring 13made of a material of high Shore hardness. The support ring 13 is madeof a material resistant to high pressure, is radially elastic and hasvery great tensile strength in the axial direction. Bronze or a springsteel are possible materials for the support ring 13. The use of alinear aromatic polymer or a polyoxymethylene plastomer has proved to beparticularly favourable with regard to fulfilling the requirements to bemet by the support ring 13.

[0019] The support ring 13 is surrounded by an axially projecting flange14 of the sealing ring 12, by virtue of which the support ring 13,fastened under prestress, presses the sealing ring 12 radially againstthe wall of the cutout 3 at the site of the flange 14 and thus affordsthe sealing ring 12 additional hold in the cutout 3. The sealing ring 12also has an all-round sealing lip 15 which protrudes obliquely into theimpression 2 of the deforming tool 1 and counter to the direction of theaxial pressure component of the high pressure deforming the outercomponent and which is supported axially by the support ring 13 so as,when the high fluid pressure is generated, to avoid gap extrusions ofthe sealing ring 12 into the gap which is present, outside thehigh-pressure action, between the sliding assembly and the impression 2and in which atmospheric pressure prevails and thus to minimize the wearof the sealing ring 12.

[0020] The sealing lip 15 has an outside diameter which is smaller thanthe outside diameter of the sliding assembly. As a result, when thesliding assembly is or the individual components are inserted into theimpression 2 of the deforming tool 1, the sealing lip 15 is bent back bythe sliding assembly or its components, so that the sealing ring 12bears against the outside of the outer component of the sliding assemblyunder prestress and, thus, has a sealing effect even before the fluidpressure build-up. Over and above this, the sealing lip 15 bridges thegap between the inner side 11 of the spacer sleeve 6 and the outercomponent, which increases during the plastic deformation of the outercomponent, by elastic recovery into its initial position correspondingto the position of non-use before the insertion of the sliding assembly.In this respect, relatively large gaps can advantageously be bridged ina high-pressure-tight manner.

[0021] Recessed into the sealing ring 12 is a notch-shaped annulargroove 16 which is open in the axial direction towards the spacer sleeve6 and the outer flank of which forms the upper side of the sealing lip15. The annular groove 16 gives the sealing lip 15 sufficient elasticitythat it is capable of being applied as closely as possible against theouter component of the sliding assembly to guarantee adequate sealingability. In this connection, the depth of the annular groove 16 shouldnot be dimensioned so large that a risk of tearing the sealing ring 12arises, but it should be large enough to ensure sufficient elasticity ofthe sealing lip 15.

[0022] On its face on both sides, the spacer sleeve 6 has an all-roundchamfer 17, via which the pressure duct 8 can be connected fluidicallyto the annular groove 16 of the sealing ring 12. As a result, when highfluid pressure is generated, the sealing lip 15 is acted on by way ofthe pressure fluid additionally via the annular groove 16, so that thelip is pressed against the outer component of the sliding assembly withgreat force, bringing about complete high-pressure-tightness. In thiscontext, the inclination of the sealing lip 15 proves advantageous, as aradial component of the fluid high pressure can act on the lip 15.

[0023] Arranged at the open end 18 of the cutout 3 is an end ring 19made of an inelastic material, which bears in an axially supportingmanner against the sealing arrangement 7. The device also comprises anaxial piston 20, by way of which the end ring 19 can be acted on. Theaxial piston 20 is inserted into a cross-sectionally widened bore 21adjacent to the open end 18 of the cutout 3 and holds the sealingarrangements 5 and 7 and the spacer sleeve 6 in position counter to thehigh pressure during production of the joint connection, by supportingthe end ring 19. The end ring 19 as a component part is necessary, incertain preferred embodiments, owing to the conically tapering borerun-out and bridges the distance, adjoining the run-out, between thesealing arrangement 7 and the end face 22 of the axial piston 20.

[0024] It is also conceivable to use the axial piston 20 to cause anaxial force to act on the sealing arrangements 5 and 7 even before thebuild-up of the high fluid pressure. When the sliding assembly has beeninserted, these sealing arrangements are, owing to their elasticity,pressed together axially by the piston 20, as a result of which thesealing rings 12 expand radially inwards and are applied against thesliding assembly with considerable force, which already leads to a greatsealing effect at the outset, that is to say before high fluid pressurebuild-up. In order to be capable of offering resistance to the highfluid pressure, the axial piston 20 is hydraulically operated. In theillustrative embodiment depicted, however, the hydraulics are forgone bydesigning the axial piston 20 in the form of a hollow screw which isscrewed into an internal thread of the bore 21. A possible alternativeto this is for the axial piston 20 and the bore 21 to be designed insuch a way that they interact in the manner of a bayonet closure.

[0025] In an advantageous arrangement of the invention, the sealingarrangements 5 and 7 can be integrated into a sealing module which canbe inserted into an all-round cutout of the impression 2 of thedeforming tool 1. In addition to the sealing arrangements 5 and 7, themodule also comprises the spacer sleeve 6, which spaces the two sealingarrangements 5 and 7 from one another, and a carrier for the sealingarrangements 5, 7 and the spacer sleeve 6. As a result of this, it ispossible in a simple manner to customize the resetting of the deviceaccording to certain preferred embodiments of the invention fordifferent applications. In this connection, it is only necessary to havepreassembled modules available, which can then be removed rapidly fromthe deforming tool 1 and exchanged. The sealing arrangements 5 and 7 andthe spacer sleeve 6 can consequently be exchanged as a whole and do nothave to be removed and fastened individually. The end ring 19 can alsoconstitute a further component of the module, as this ring has to bematched to the diameter of the sealing arrangement 7 and thereforelikewise has to be changed on exchange of this arrangement.

[0026] The method for connecting two components by way of high fluidpressure is carried out as follows. Two components, an inner component23 and an outer component 24, are pushed onto one another in a suitablemanner, so that some overlapping or even complete overlapping of the twocomponents 23, 24 is achieved, which are then loosely interconnected ina sliding fit (FIG. 2). The inner component 23 can be hollow, but in thedepicted case consists of solid material and has a polygonal crosssection, the corners being interconnected by a curvature 25 of the solidmaterial. During subsequent pressing against the outer component 24,this curvature 25 makes possible smooth contact and at the same timeprevents a notch effect which damages both component and connection.Alternatively, the component 23 can also have any other shape. Here, thecomponent 24 is cylindrical, but can also have other hollowcross-sectional shapes.

[0027] The sliding assembly can be assembled outside the deforming tool1 and then inserted—or, in the case of a divided tool 1, placed—into thedeforming tool 1. It is also conceivable for the sliding assembly to beassembled in the deforming tool 1, in which case it is constructionallypreferable for it to be possible to insert the individual components 23and 24 into the impression 2 of the deforming tool 1 from both itssides. The insertion of the sliding assembly into the impression 2 canalso take place when the deforming tool 1 is closed, that is to say whenthe axial piston 20 is inserted or screwed into the bore 21 and bearsagainst the end face of the end ring 19. In the case of relatively longcomponents 23, 24, or in the case of the sliding assembly beingassembled in the tool 1, the axial piston 20 has, in the case of theclosed tool 1, an axial passage opening 26 which is aligned with theimpression 2 of the tool 1 and the spacer sleeve 6 and through which thesliding assembly or one of the two components 23, 24 is guided.

[0028] High fluid pressure is then applied, by the external highfluid-pressure generator being actuated and conducting a pressure fluidvia the pressure duct 8 to the sliding assembly between the sealingarrangements 5 and 7. The pressure fluid is then pressurized until adeforming pressure is reached, at which the outer component 24 of thesliding assembly, the material of which has a yield point which is lowerthan that of the inner component 23, is plastically deformed in such amanner that it, as it were, shrinks onto the inner component 23. Thedeforming pressure is at just such a level that the inner component 23is only elastically deformed, that is to say compressed. After the outercomponent 24 has been pressed thus onto the inner component 23, the highpressure is then released, whereupon the elastically compressed innercomponent 23 and the plastically deformed outer component 24 recoverelastically.

[0029] As the yield points of the two components 23 and 24 are different(R_(e,23)>R_(e,24)), the inner part 23 recovers by a greater amount thanthe outer part 24. A state of equilibrium is consequently brought about,in which the component 24 is under radial tensile stress and thecomponent 23 is under compressive stress. At the interface, a sustainedsurface pressure and thus a strong joint connection are consequentlyachieved. The components 23 and 24 thus bear against one another, in avery strong press fit, in a frictionally locking manner and, on accountof the rotational symmetry of the inner component 23 shown, in apositively locking manner at least at a number of circumferential sites,so that they are fixed to one another in both the axial and the radialdirection (FIG. 3).

[0030] While the outer component 24 is acted on directly by the pressurefluid in the illustrative embodiment shown, the high pressure can alsobe transferred to the component 24 by way of a diaphragm arranged in theimpression 2 or on the spacer sleeve 6. Furthermore, the outer component24 does not necessarily have to be pressed together with the innercomponent 23 over the entire overlapping area of the sliding assembly,but this can take place over only an axial portion of the overlappingarea according to the dimensioning of the spacing of the sealingarrangements 5 and 7 from one another. It is moreover possible withinthe scope of the invention, when a hollow, in particular tubular, innercomponent 23 is used and very high deforming pressures are required, tosupport the component 23 on the inside using a solid counterstay tool.Otherwise, the outer component 24 is pressed in a simple manner in termsof apparatus and method against the outer wall of the hollow innercomponent 23 without any support with regard to the inner component 23.

[0031] The invention can find application in, for example, bodyconstruction in carcass structures of vehicles, steering columns or inbumper bending members.

[0032] The foregoing disclosure has been set forth merely to illustratethe invention and is not intended to be limiting. Since modifications ofthe disclosed embodiments incorporating the spirit and substance of theinvention may occur to persons skilled in the art, the invention shouldbe construed to include everything within the scope of the appendedclaims and equivalents thereof.

What is claimed is:
 1. Method for connecting two components by highfluid pressure, the components being pushed onto one another, and thetwo components then being pressed against one another by way of the highpressure, wherein an outer component of the two components, the materialof which has a yield point which is lower than that of an innercomponent of the two components, is plastically deformed byhigh-pressure action acting on the two components from outside, theinner component being elastically deformed.
 2. Method according to claim1, wherein the outer component is acted on directly by the fluidpressure.
 3. Method according to claim 1, wherein the outer component ispressed against the inner component in a positively locking manner atleast over a partial circumferential area.
 4. Method according to claim2, wherein the outer component is pressed against the inner component ina positively locking manner at least over a partial circumferentialarea.
 5. Method according to claim 1, wherein the outer component ispressed together with the inner component over only an axial portion ofan overlapping area of the two components.
 6. Method according to claim2, wherein the outer component is pressed together with the innercomponent over only an axial portion of an overlapping area of the twocomponents.
 7. Method according to claim 3, wherein the outer componentis pressed together with the inner component over only an axial portionof an overlapping area of the two components.
 8. Method according toclaim 1, wherein the outer component is pressed against an outer wall ofthe inner component, which is hollow, without any support with regard tothe inner component.
 9. Method according to claim 2, wherein the outercomponent is pressed against an outer wall of the inner component, whichis hollow, without any support with regard to the inner component. 10.Method according to claim 3, wherein the outer component is pressedagainst an outer wall of the inner component, which is hollow, withoutany support with regard to the inner component.
 11. Method according toclaim 5, wherein the outer component is pressed against an outer wall ofthe inner component, which is hollow, without any support with regard tothe inner component.
 12. Device for connecting two components by way ofhigh fluid pressure, comprising a high fluid-pressure generator and adeforming tool, which is connected fluidically to the highfluid-pressure generator and by which a sliding assembly of thecomponents pushed onto one another can be acted on by the fluid pressurein such a manner that the components bear against one another in a pressfit, wherein the deforming tool surrounds the sliding assembly at leastat a site of the press fit to be produced, wherein the deforming toolhas a pressure duct which, connected to the high-fluid-pressuregenerator, leads from outside into an impression of the tool, whichreceives the sliding assembly, and an outlet of the duct is located atthe site of the press fit to be produced, and wherein a sealingarrangement is arranged on an inner side of the impression on both sidesof the site of the press fit to be produced, said sealing arrangementssealing said site axially in a high-pressure-tight manner.
 13. Deviceaccording to claim 12, wherein the sealing arrangement comprises anelastic sealing ring made of an elastomer, and a support ring made of amaterial of high Shore hardness which bears against the sealing ring ona side facing away from the site of the press fit.
 14. Device accordingto claim 13, wherein the sealing ring has an all-round sealing lip whichprotrudes obliquely into the impression of the deforming tool andcounter to a direction of an axial pressure component of the highpressure deforming the outer component and which is supported by thesupport ring.
 15. Device according to claim 12, wherein the sealingarrangements are integrated into a sealing module which can be insertedinto an all-round cutout of the impression of the deforming tool. 16.Device according to claim 13, wherein the sealing arrangements areintegrated into a sealing module which can be inserted into an all-roundcutout of the impression of the deforming tool.
 17. Device according toclaim 14, wherein the sealing arrangements are integrated into a sealingmodule which can be inserted into an all-round cutout of the impressionof the deforming tool.
 18. Device according to claim 15, wherein, inaddition to the sealing arrangements, the module comprises a spacersleeve, which spaces the two sealing arrangements from one another, anda carrier for the sealing arrangements and the spacer sleeve.
 19. Deviceaccording to claim 18, wherein the pressure duct extends through a wallof the spacer sleeve.
 20. Device according to claim 18, wherein an innerside of the spacer sleeve forms a majority of the impression of thedeforming tool along the site of the press fit to be produced. 21.Device according to claim 19, wherein an inner side of the spacer sleeveforms a majority of the impression of the deforming tool along the siteof the press fit to be produced.
 22. Device according to claim 12,wherein, on a side of the impression, the pressure duct opens into anall-round recess which extends along the site of the press fit to beproduced.
 23. Device according to claim 13, wherein, on a side of theimpression, the pressure duct opens into an all-round recess whichextends along the site of the press fit to be produced.
 24. Deviceaccording to claim 15, wherein, on a side of the impression, thepressure duct opens into an all-round recess which extends along thesite of the press fit to be produced.
 25. Device according to claim 18,wherein, on a side of the impression, the pressure duct opens into anall-round recess which extends along the site of the press fit to beproduced.
 26. Device according to claim 22, wherein the all-round recessis covered by an elastic diaphragm towards the impression, saiddiaphragm being fastened to a wall of the impression or an inner side ofa spacer sleeve.
 27. Device according to claim 23, wherein the all-roundrecess is covered by an elastic diaphragm towards the impression, saiddiaphragm being fastened to a wall of the impression or an inner side ofa spacer sleeve.
 28. Device according to claim 24, wherein the all-roundrecess is covered by an elastic diaphragm towards the impression, saiddiaphragm being fastened to a wall of the impression or an inner side ofa spacer sleeve.
 29. Device according to claim 25, wherein the all-roundrecess is covered by an elastic diaphragm towards the impression, saiddiaphragm being fastened to a wall of the impression or an inner side ofthe spacer sleeve.
 30. Device according to claim 12, wherein anall-round cutout, which is open on one side axially and receives thesealing arrangements, and a spacer sleeve which spaces the sealingarrangements from one another, is recessed into the impression, whereinan end ring of an inelastic material bears against the sealingarrangement lying at an open end of the cutout, and wherein the devicefurther comprises an axial piston, by which the end ring can be actedon.
 31. Device according to claim 13, wherein an all-round cutout, whichis open on one side axially and receives the sealing arrangements, and aspacer sleeve which spaces the sealing arrangements from one another, isrecessed into the impression, wherein an end ring of an inelasticmaterial bears against the sealing arrangement lying at an open end ofthe cutout, and wherein the device further comprises an axial piston, bywhich the end ring can be acted on.
 32. Device according to claim 14,wherein an all-round cutout, which is open on one side axially andreceives the sealing arrangements, and a spacer sleeve which spaces thesealing arrangements from one another, is recessed into the impression,wherein an end ring of an inelastic material bears against the sealingarrangement lying at an open end of the cutout, and wherein the devicefurther comprises an axial piston, by which the end ring can be actedon.
 33. Device according to claim 15, wherein an all-round cutout, whichis open on one side axially and receives the sealing arrangements, and aspacer sleeve which spaces the sealing arrangements from one another, isrecessed into the impression, wherein an end ring of an inelasticmaterial bears against the sealing arrangement lying at an open end ofthe cutout, and wherein the device further comprises an axial piston, bywhich the end ring can be acted on.
 34. Device according to claim 22,wherein an all-round cutout, which is open on one side axially andreceives the sealing arrangements, and a spacer sleeve which spaces thesealing arrangements from one another, is recessed into the impression,wherein an end ring of an inelastic material bears against the sealingarrangement lying at an open end of the cutout, and wherein the devicefurther comprises an axial piston, by which the end ring can be actedon.
 35. Device according to claim 26, wherein an all-round cutout, whichis open on one side axially and receives the sealing arrangements, and aspacer sleeve which spaces the sealing arrangements from one another, isrecessed into the impression, wherein an end ring of an inelasticmaterial bears against the sealing arrangement lying at an open end ofthe cutout, and wherein the device further comprises an axial piston, bywhich the end ring can be acted on.
 36. Device according to claim 30,wherein the axial piston has an axial passage opening forguiding-through the components pushed onto one another.
 37. Deviceaccording to claim 30, wherein the axial piston is designed as a hollowscrew which can be screwed into an internal thread of across-sectionally widened bore adjacent to the open end of the cutout.38. Device according to claim 36, wherein the axial piston is designedas a hollow screw which can be screwed into an internal thread of across-sectionally widened bore adjacent to the open end of the cutout.39. Device according to claim 30, wherein the axial piston can beoperated hydraulically.
 40. Device according to claim 36, wherein theaxial piston can be operated hydraulically.
 41. Device according toclaim 12, wherein the deforming tool is of one-piece design.
 42. Deviceaccording to claim 13, wherein the deforming tool is of one-piecedesign.
 43. Device according to claim 14, wherein the deforming tool isof one-piece design.
 44. Device according to claim 15, wherein thedeforming tool is of one-piece design.
 45. Device according to claim 18,wherein the deforming tool is of one-piece design.
 46. Device accordingto claim 22, wherein the deforming tool is of one-piece design. 47.Device according to claim 30, wherein the deforming tool is of one-piecedesign.
 48. A method for connecting using fluid pressure, comprising:pushing an outer component onto an inner component, a material of theouter component having a yield point lower than a material of the innercomponent, and pressing the components against one another by way of thefluid pressure, whereby the outer component is plastically deformed bypressure acting on the components from outside, and the inner componentis elastically deformed.
 49. A method according to claim 48, wherein theouter component is acted on directly by the fluid pressure.
 50. A methodaccording to claim 48, wherein the outer component is pressed againstthe inner component in a positively locking manner at least over apartial circumferential area.
 51. A method according to claim 48,wherein the outer component is pressed together with the inner componentover only an axial portion of an overlapping area of the two components.52. A method according to claim 48, wherein the outer component ispressed against an outer wall of the inner component, which is hollow,without any support with regard to the inner component.
 53. A connectionassembly, comprising: an inner component, and an outer component havinga material with a yield point lower than a material of the innercomponent, wherein the components are pushed onto one another andpressed against one another by way of fluid pressure so that the outercomponent is plastically deformed by pressure acting on the twocomponents from outside, and the inner component is elasticallydeformed.
 54. A connection assembly according to claim 52, wherein theouter component is pressed against the inner component in a positivelylocking manner at least over a partial circumferential area.
 55. Aconnection assembly according to claim 52, wherein the outer componentis pressed together with the inner component over only an axial portionof an overlapping area of the two components.
 56. A method of making aconnection between an inner and outer component using fluid pressure,comprising: pushing an outer component onto an inner component, amaterial of the outer component having a yield point lower than amaterial of the inner component, and pressing the components against oneanother by way of the fluid pressure, whereby the outer component isplastically deformed by pressure acting on the components from outside,and the inner component is elastically deformed.
 57. An apparatus forconnecting an inner and outer component by way of fluid pressure,comprising: a fluid-pressure generator, and a deforming tool beingconnected fluidically to the fluid-pressure generator, whereby thecomponents pushed onto one another can be operatively acted upon by wayof the fluid pressure so that the components bear against one another ina press fit, wherein the deforming tool operatively surrounds thecomponents at least at a site of the press fit to be produced, whereinthe deforming tool has a pressure duct which is connected to thefluid-pressure generator and leads from outside into an impression ofthe deforming tool, wherein the impression operatively receives thecomponents, wherein an outlet of the duct is located at the site of thepress fit to be produced, and wherein a sealing arrangement is arrangedon an inner side of the impression on both sides of the site of thepress fit to be produced, the sealing arrangement operatively sealingthe site axially in a high-pressure-tight manner.